I would suggest that you try it for a minute or so on the very lowest power level and see if it shuts off.
If so, please post again with more detail about how it fails, such as whether it loses all power as if someone unplugged it or just acts as if someone hit the STOP button.

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Related Questions:

When a Panasonic Inverter Microwave shuts off after a feew seconds, it is either a bad inverter which is the quite expensive circuit board that powers the magnetron that puts out the microwave energy, or a bad magnetron, Or BOTH typically this would be a costly repair, But since it is still under warranty. You need to find a Panasonic warranty service provider in your area. If it is a counter top unit, you may have to take it to them for repair.

Main control boardIf
your microwave runs for a few seconds and stops, the first thing to
check is the main control board to ensure that a shortage has not
occurred. If the part is defective then it will need to be replaced to
prevent continual shut offs. If this is not the issue, the next step
would be to check for a faulty touchpad.

Touchpad/Control panelIf
the control board is not the issue and your microwave continues to shut
off after running for only a few seconds, the next thing to check is
your touchpad, which is also known as a control panel. Although uncommon
for this issue, symptoms are usually that the display and some buttons
are working properly; however, when selected some buttons are not
functioning. If this is the case the touchpad will need to be replaced.

Step 1:

Door Switch

If the microwave runs for a few seconds and then shuts off, a door switch might have failed intermittently. Check each of the door switches for any signs of overheating, arcing, or burning. Also check each of them for continuity. Replace any of the switches that is visibly damaged or that only has continuity intermittently

Step 2:

Main
Control Board

If
the microwave runs for a few seconds and stops there may be a short
circuit in the main control board. Check other components first,
these boards are often misdiagnosed.

Touchpad
and Control Panel

If
the microwave runs for a few seconds and stops the touchpad and
control panel might be defective. There are several other components
that can cause this problem, be sure to check any other components
before replacing this board.

Touchpad

If
the microwave runs for a few seconds and stops the touchpad might be
at fault. This is not common. Generally speaking, if the microwave
display is working and some of the buttons respond correctly but
some don't, the problem is with the touchpad.

High
Voltage Transformer

If
the microwave runs for a few seconds and stops the high voltage
transformer might have an intermittent short. This is not common.
Check other components related to the microwave symptom first.

Thermostat

If
the microwave runs for a few seconds and stops the thermostat might
be defective. Watch our video on testing thermostat

see this causes and fix it. God bless youDoor Switch
If the microwave runs for a few seconds and
then shuts off, a door switch might have failed intermittently. Check
each of the door switches for any signs of overheating, arcing, or
burning. Also check each of them for continuity. Replace any of the
switches that is visibly damaged or that only has continuity
intermittently.
Main Control Board
If the microwave runs for a few seconds and
stops there may be a short circuit in the main control board. Check
other components first, these boards are often misdiagnosed. Touchpad and Control Panel
If the microwave runs for a few seconds and
stops the touchpad and control panel might be defective. There are
several other components that can cause this problem, be sure to check
any other components before replacing this board.

Touchpad
If the microwave runs for a few seconds and
stops the touchpad might be at fault. This is not common. Generally
speaking, if the dishwasher display is working and some of the buttons
respond correctly but some don't, the problem is with the touchpad.

High Voltage Transformer
If the microwave runs for a few seconds and
stops the high voltage transformer might have an intermittent short.
This is not common. Check other components related to the microwave
symptom first.

Thermoprotector
If the microwave runs for a few seconds and
stops the thermoprotector may have tripped. This is a safety device to
prevent the microwave from overheating. It can be tested for continuity
to see if it's blown.

Thermostat
If the microwave runs for a few seconds and
stops the thermostat might be defective. Watch our video on testing
thermostats.

see this causes and fix it. God bless youIf the microwave runs for a few seconds and stops the thermostat might be defective. Watch our video on testing thermostats.
If the microwave runs for a few seconds and stops the thermoprotector
may have tripped. This is a safety device to prevent the microwave from
overheating. It can be tested for continuity to see if it's blown.
If the microwave runs for a few seconds and stops the high voltage
transformer might have an intermittent short. This is not common. Check
other components related to the microwave symptom first.
If the microwave runs for a few seconds and stops the touchpad might be
at fault. This is not common. Generally speaking, if the dishwasher
display is working and some of the buttons respond correctly but some
don't, the problem is with the touchpad.
If the microwave runs for a few seconds and stops the touchpad and
control panel might be defective. There are several other components
that can cause this problem, be sure to check any other components
before replacing this board.
If the microwave runs for a few seconds and stops there may be a short
circuit in the main control board. Check other components first, these
boards are often misdiagnosed.
If the microwave runs for a few seconds and then shuts off, a door
switch might have failed intermittently. Check each of the door switches
for any signs of overheating, arcing, or burning. Also check each of
them for continuity. Replace any of the switches that is visibly damaged
or that only has continuity intermittently.

I found an envelope with troubleshooting info inside the microwave on the left side behind the front vent. A troubleshooting flowchart was included which indicates that this problem is caused by the high voltage capacitor. I got mine out pretty easy and ordered one from appliancepartspros.com for $55 (which includes expedited shipping. I hope this info helps.